Cumbersome 3, Pierce 2, Slow-Firing 1, As a maneuver, prime the cannon to expend all ammunition in a single shot. The next shot counts as having the Breach 1 and Vicious 3 qualities, and the weapon runs out of ammunition.

Auto-Fire, Cumbersome 4, As maneuver, prime weapon to expend all ammunition in a single shot. The next shot counts as having the Blast 7 and Concussive 1 qualities, doesn't have Auto-fire, and runs out of ammunition.